The only quilts I have NOT labeled are the ones I've kept for me, and I keep meaning to label those before I forget when and why I made them. It may seem like no big deal now, but someday someone is going to want to know who made this quilt, who it was made for, what the occasion was, etc. It really doesn't take long and it doesn't have to be fancy. I use permanent markers to draw my labels on muslin w/ freezer paper ironed on the back. I just got an embroidery machine and have even downloaded a couple of frames for quilt labels, but I haven't tried them out yet. On my labels, I try to include not just who it was for, when and why, but also maybe the name of the pattern, who or what inspired my design, etc. The more info you include, the more interesting it will be to posterity.